Caption: Genetically modified cotton plants. View along two rows of genetically modified (GM) 'Roundup Ready' cotton plants (Gossypium hirsutum). These plants are from stock that has had a gene introduced by genetic engineering, which makes it resistant to Roundup herbicide. A crop of 'Roundup Ready' cotton can therefore be sprayed with the herbicide to kill weeds, but without damaging the cotton plants. This theoretically increases cotton yields, but there is concern over the safety of GM technology. The remains of the previous crop are also seen. Photographed in Mississippi, USA.